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Hello, I have a Kettler Ergometer E3 model since several years and have never experienced any problems until now. Once I start cycling and want to increase the difficulty (or change any setting for that matter), I get a message OPO 688, with a bip, which appears on the screen and it won't allow me to change any settings. The screen functions ok when cycling with the lowest tension but if I try to raise the tension level, this message keeps coming back and I have to start from scratch. Any ideas? There's absolutely nothing in the manual regarding troubleshooting and impossible to find any assistance online! Thanks. Submitted on 11-4-2020 at 10:36
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